Benno hands over the book

Benno of Uppsala, a young Scandinavian monk devoted to rhetoric, undergoes a decisive moral reversal on the fifth day of the abbey's crisis. Having earlier professed a scholar's right to all knowledge and condemned the library's secrecy, he betrays that principle the moment he is offered the post of assistant librarian. His surrender of the forbidden Greek manuscript—the same book that had cost Venantius, Berengar, and Severinus their lives—marks his transformation from a seeker of truth into a guardian of the very mysteries he had wanted to expose.

Identity and Intellectual Ambition

Benno is introduced as a student of rhetoric, a man who burns with the desire to know what the library conceals. During the scriptorium debate on laughter, he sides with Venantius and Adelmo against Jorge's condemnation of comic marginalia, quoting pagan poets and defending the value of witty riddles. He tells William that he would be prepared to commit shameful acts to get his hands on a rare book, and he admits that the desire of the intellect can be as violent as any carnal passion. His curiosity is not the humble love of learning that Roger Bacon advocated; it is, as William later diagnoses, a sterile lust for knowledge for its own sake.

The Betrayal of the Book

On the morning of the fifth day, after Severinus is murdered and the forbidden manuscript disappears from the infirmary, Benno secretly recovers it from the laboratory. He hides it under his pallet without reading it, aware that Malachi is watching him. When Malachi, desperate to recover the book and seal Benno's silence, offers him the position of assistant librarian, Benno accepts. He hands the manuscript over to Malachi without hesitation. When William confronts him that evening, Benno justifies his action with a newly virtuous air: "I cannot tell by order of the abbot." He has crossed from the side of the curious to the side of the custodians.

William's Judgment and Thematic Significance

William's reaction is one of cold disappointment rather than surprise. He tells Adso that Benno is the victim of a great lust—not of the flesh, but of the intellect. "Like many scholars, he has a lust for knowledge. Knowledge for its own sake." William contrasts this with Roger Bacon's thirst for learning, which sought to make God's people happier. Benno's is merely insatiable curiosity, intellectual pride, another way for a monk to transform the desires of his loins. "True love wants the good of the beloved," William says, and the good of a book lies in its being read. By handing the book over to Malachi, Benno has betrayed not only his own principles but the very purpose of the library. He has become a guardian of secrets, not a servant of truth.

Consequences and Fate

Benno's betrayal does not save him. Later that same night, when the library catches fire, he is seen rushing up the stairs with a water vessel, shouting at those who retreat. He plunges into the smoke and is never seen again. His death, like those of the monks he had hoped to succeed, is swallowed by the conflagration that consumes the labyrinth he had so desperately wanted to enter. His brief tenure as assistant librarian ends not in the quiet mastery of forbidden knowledge, but in the chaos of the fire that destroys everything he had sought to possess.